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Quantum 2.0 Conference and Exhibition

Quantum photo-thermodynamics on a programmable photonic quantum processor

Malaquias Correa Anguita, F. H. B. Somhorst, Reinier van der Meer, Riko Schadow, Henk Snijders, Michiel de Goede, Ben Kassenberg, Pim Venderbosch, Caterina Taballione, Jörn P. Epping, Hans H. van den Vlekkert, Jacob F. F. Bulmer, Jasleen Lugani, Ian A. Walmsley, Pepijn W. H. Pinkse, Jens Eisert, Nathan Walk, Jelmer J. Renema

Published Jan 1, 2022• 3 citations
Publisher

Abstract

We experimentally investigate the relation between thermodynamics and quantum mechanics by demonstrating equilibration of a quantum state towards a thermal state in an integrated quantum photonics platform.
DOI
10.1364/quantum.2022.qtu3a.3

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One of the core questions of quantum physics is how to reconcile the unitary evolution of quantum states, which is information-preserving and time-reversible, with evolution following the second law of thermodynamics, which, in general, is neither. The resolution to this paradox is to recognize that global unitary evolution of a multi-partite quantum state causes the state of local subsystems to evolve towards maximum-entropy states. In this work, we experimentally demonstrate this effect in linear quantum optics by simultaneously showing the convergence of local quantum states to a generalized Gibbs ensemble constituting a maximum-entropy state under precisely controlled conditions, while introducing an efficient certification method to demonstrate that the state retains global purity. Our quantum states are manipulated by a programmable integrated quantum photonic processor, which simulates arbitrary non-interacting Hamiltonians, demonstrating the universality of this phenomenon. Our results show the potential of photonic devices for quantum simulations involving non-Gaussian states.